Adding columns with multiple variables

Hi All,
What I'd like to do is to have a dashboard showing all of the Invoice totals from the preceding tab (Invoices).
If there is no Station named then it is a Project Spend, and I just want it to be totaled under the correct subcategory.
If there is a station listed then I want it to fall under the correct station and the correct sub-category.

I have tried an If, Than formula which did not work, so I thought I would ask the Forum before I continue down the worng path.

I've attached a sample dummy spreadsheet.

Thanks